Main character's ability destroys own body

Looking for manga / anime / LN / VN in which the main character's special ability destroys his or her own body cruelly. For example, if it has a demon / angel / etc in its body, then using it's ability would say, destroy(or otherwise severely damage) sections of its body, in exchange for using it (e.g. transforming body part into weapon) as opposed to just cleanly manifesting itself (like Soul Eater).

Notice the bold parts.Please no stereotypical shoujo romance.

Edit: To clarify, I want it to be readily apparent. It can be something that recovers, the wound could heal, but it has to be readily noticeable and unpleasant. Like a gory Soul Eater as pointed out by Blique. Please no life force drifting away gradually, if life force is gonna go it better be extreme like Bokurano.

Noblesse - The main character uses his life force when he uses his ability.Gokukoku no Brynhildr - It's not so much the use of abilities, it's that once they were made that way, their bodies will start disintegrating without medicine.Bokurano - Kind of. The children die after piloting once. It focuses on the psychological aspects.

Defiantly NABARI NO OU, its not the MC but one of the main character has this technique called Kira that slowly kills the user. The destruction isn't just internal, its also physical which is why he wears gloves to hide his deforming body. (When I say deforming, I mean the skin color changes)

Ajin - the ability manifests itself because of painful situations which the person still feelsPupa - again ability to survive painful situationsDouble Gauge main character is always sick because of his ability

Ah right I forgot this one! It is rare to see a fire user actually burned after using their ability.Haru no Houtai Shoujo

Last edited by booknik at 11:40 am, Jan 26

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